English Yew Toxic?

Updated 2026-03-06| 2 min read| 1,818 found this helpful

All plant parts except the red seed coat and unchewed seeds are toxic, with highest alkaloid content in winter, and toxicity is not reduced by drying or cooking.

Ingestion can cause sudden death from acute heart failure within minutes in horses, even before other visible symptoms appear.

Asymptomatic horses that have ingested the plant require continuous EKG monitoring to catch life-threatening cardiac abnormalities early.

FAQ

Is English Yew toxic to Humans?

No human-specific symptom data provided; expected to include cardiac distress, tremors, respiratory difficulty, and potential sudden death consistent with animal reaction. (Severe)

Is English Yew toxic to Cats?

Tremors, difficulty breathing, vomiting, seizures, acute heart failure leading to sudden death (Severe)

Is English Yew toxic to Dogs?

Tremors, difficulty breathing, vomiting, seizures, acute heart failure leading to sudden death (Severe)

Is English Yew toxic to Horses?

Sudden death within minutes of ingestion, ataxia, bradycardia, dyspnea, muscle tremors, collapse, seizures, gastroenteritis and nephritis in prolonged cases (Severe)

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Toxicity Details

Humans

Severe

No human-specific symptom data provided; expected to include cardiac distress, tremors, respiratory difficulty, and potential sudden death consistent with animal reaction.

Cats

Severe

Tremors, difficulty breathing, vomiting, seizures, acute heart failure leading to sudden death

Dogs

Severe

Tremors, difficulty breathing, vomiting, seizures, acute heart failure leading to sudden death

Horses

Severe

Sudden death within minutes of ingestion, ataxia, bradycardia, dyspnea, muscle tremors, collapse, seizures, gastroenteritis and nephritis in prolonged cases

Toxicity Snapshot

Toxic PartsAll plant parts except the red seed coating (aril) and unchewed seeds; needles and chewed seeds are especially toxic

Exposure RoutePrimary exposure route is ingestion of plant material

Toxic CompoundsTaxine A; Taxine B; Isotaxin B; 2-Deacetyltaxin A; 1-Deoxytaxin B; 1-Deoxyisotaxin B; Taxin I; Taxol; Volatile oil; Biflavonoids (polyphenols)

First Aid & Prevention

First 30 Minutes

• Immediately perform digestive decontamination (safe induced vomiting, activated charcoal) if ingestion was recent to remove residual plant material
• Move the affected animal to a quiet, low-stress area to avoid exacerbating cardiac strain
• Do not wait for symptoms to develop before seeking veterinary care, especially for horses

Contact Vet Immediately

• Immediately if any amount of the plant is ingested by any animal, even if no symptoms are present
• If symptoms including tremors, labored breathing, vomiting, seizures, or abnormal heart rate appear
• If the ingesting animal is a horse, as sudden death can occur within minutes of exposure

Prevention

• Keep all English Yew plant parts out of reach of pets, livestock, and children
• Do not discard pruned Yew clippings in areas accessible to animals, as drying does not reduce toxicity
• Learn to distinguish English Yew from non-toxic similar conifers to avoid accidental exposure

Treatment & Prognosis

• Provide decontamination and symptomatic supportive care per emergency toxicology protocols
• Administer atropine sulfate to treat bradycardia and AV block, lidocaine for ventricular tachyarrhythmia and ventricular fibrillation
• For horses, provide continuous EKG monitoring even if the animal is asymptomatic after ingestion
• For ruminants, rumenotomy may be performed to remove ingested plant material from the digestive tract

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Professional Toxicology

Scientific NameTaxus baccata

AliasesWestern Yew、Pacific Yew、Japanese Yew、Anglo-Japanese Yew

Toxicity Grade

HumansSevere

CatsSevere

DogsSevere

HorsesSevere

Target Organs

HeartCentral Nervous SystemRespiratory SystemGastrointestinal TractKidneys

Mechanism of Action

• Primary toxic alkaloids (dominantly Taxine B) disrupt cardiac electrical function, triggering arrhythmias, bradycardia, and acute heart failure

• Toxic compounds also impact the central nervous system, causing tremors, seizures, and respiratory distress

• Toxic alkaloid content ranges from 0.6-2% of plant material, with highest concentration present in winter months

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Birds: Severely toxic, exposure can lead to severe symptoms and death

Cattle: Sudden death after ingestion reported; prolonged cases present with gastroenteritis and nephritis

Deer: Sudden death following ingestion has been documented

Brown bear: Sudden death following ingestion has been documented

Confusion Risk

The following plants look similar and may be confused:

Other Yew species Other Taxus spp.

Nearly identical in appearance to English Yew; all other Taxus species are also severely toxic, with no easy visual differences for non-experts to distinguish them

Silver Fir Abies alba

Visually similar to English Yew, but has softer, less sharply pointed needles and only low toxicity, unlike the severe toxicity of English Yew

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Related Toxic Plants

Pacific Yew

Taxus brevifolia

Severely Toxic

Japanese Yew

Taxus cuspidata

Severely Toxic

Florida Yew

Taxus floridana

Severely Toxic

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Data Sources

1. ASPCA Animal Poison Control

2. CliniTox (Universität Zürich)

This information is for reference only and does not constitute medical advice. If ingestion or poisoning is suspected, seek medical or veterinary attention immediately.